“Well,” said Grettir, “I will risk it with you; but know of a surety that if I suspect you of any treachery it will be your death.”

Thorir agreed.  Grettir took him in and found that in whatever he did he had the strength of two men.  He was ready for anything that Grettir gave him to do.  Nothing did Grettir need to do for himself, and he had never lived so comfortably since he had become an outlaw.  Nevertheless he was so wary that Thorir got no chance.  Two years was Thorir Redbeard with Grettir on the Heath, and at last he began to weary of it.  He thought over what he could do to take Grettir off his guard.

One night in the spring a heavy gale sprang up while they were asleep.  Grettir awoke and asked where their boat was.  Thorir sprang up, ran to the boat, broke her all in pieces, and threw the fragments about so that it looked as if the storm had wrecked her.  Then he returned to the hut and said aloud:  “You have had bad luck, my friend.  Our boat is all broken in pieces and the nets are lying far out in the lake.”

“Get them back then,” said Grettir.  “It seems to me to be your doing that the boat is smashed.”

“Of all things which I can do,” said Thorir, “swimming is that which suits me least.  In almost anything else I think I can hold my own with any ordinary man.  You know very well that I have been no burden to you since I came here; nor would I ask you to do this if I were able to do it myself.”

Grettir then arose, took his arms and went to the lake.  There was a point of land running out into the lake with a large bay on the further side of it.  The water was deep up to the shore.  Grettir said:  “Swim out to the nets and let me see what you are able to do.”

“I told you before,” Thorir said, “that I cannot swim.  I do not know now where all your boldness and daring are gone to.”

“I could get the nets,” he said; “but betray me not if I trust you.”

“Do not think such shameful and monstrous things of me,” said Thorir.

“You will prove yourself what you are,” Grettir said.

Then he threw off his clothes and his weapons and swam out to the nets.  He gathered them together, returned to the shore and cast them up on to the bank.  Just as he was about to land Thorir quickly seized his short sword and drew it.  He ran towards Grettir as he stepped on to the bank and aimed a blow at him.  Grettir threw himself down backwards into the water and sank like a stone.  Thorir stood by the shore intending to guard it until he came up.  Grettir swam beneath the water, keeping close to the bank so that Thorir could not see him, and so reached the bay behind him, where he landed without letting himself be seen.  The first Thorir knew of it was when Grettir lifted him up over his head and dashed him down with such violence that the sword fell out of his hand.  Grettir got possession of it and without speaking a word cut off his head.  So his life ended.  After that Grettir refused to take in any forest-men, and yet he could not live alone.